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JAMB Chemistry 1991 Question 26

Question 26

Redox Reactions

2H2S(g) + SO2(g) → 3S(s) + 2H2O(l). The above reaction is

  1. A.a redox reaction in which H2S is the oxidant and SO2 is the reductant
  2. B.a redox reaction in which SO2 is the oxidant and H2S is the reductant
  3. C.not a redox reaction because there is no oxidant in the reaction equation
  4. D.not a redox because there is no reductant in the reaction equation.
Show the answer and explanation

Answer: B (a redox reaction in which SO2 is the oxidant and H2S is the reductant)

Explanation

Sulphur in SO2 goes from +4 to 0 (reduced, so SO2 is the oxidant) and sulphur in H2S goes from −2 to 0 (oxidized, so H2S is the reductant).